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Microwave dielectric properties of (1 − x)MgTiO3−x(Ca0.6Na0.2Sm0.2)TiO3 ceramic system

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Abstract

The microstructures and microwave dielectric properties of (1 − x)MgTiO3–x(Ca0.6Na0.2Sm0.2)TiO3 ceramics prepared by the conventional solid-state reaction route have been investigated with the variation of x as well as sintering temperature, aiming to achieve a material with a high quality factor and nearly zero temperature coefficient of resonant frequency (τ f ). The crystalline phases and the microstructures of the ceramics have been characterized by means of X-ray diffraction and scanning electron microscopy. The microwave dielectric properties of the ceramic system have been found strongly related to the density, sintering temperature, x value, second phase as well as the microstructure of the ceramic samples. The 0.89MgTiO3–0.11(Ca0.6Na0.2Sm0.2)TiO3 ceramic system, sintering at 1250 °C for 4 h, showed excellent microwave dielectric properties with εr ~ 22.8, Q × f ~ 76000 GHz (at 8 GHz) and τ f  ~ −3.1 ppm/°C. It could be a suitable candidate material for microwave applications. Moreover, the theoretical dielectric constant of this system has been calculated using various mixing formulae based on the effective medium models.

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Authors and Affiliations

  1. School of Electronic and Information Engineering and Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin, 300072, China

    Lingxia Li, Sai Li, Xiaosong Lyu, Jing Ye & Hao Sun

  2. College of Basic Medicine, Tianjin Medical University, Tianjin, 300072, China

    Tian Tian

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  1. Lingxia Li
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Li, L., Li, S., Tian, T. et al. Microwave dielectric properties of (1 − x)MgTiO3−x(Ca0.6Na0.2Sm0.2)TiO3 ceramic system. J Mater Sci: Mater Electron 27, 1286–1292 (2016). https://doi.org/10.1007/s10854-015-3887-1

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